<template>
  <div class="component-upload-image">
    <el-upload
      multiple
      :action="uploadImgUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      name="file"
      :on-remove="handleRemove"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: fileList.length >= limit }"
    >
      <el-icon class="avatar-uploader-icon"><plus /></el-icon>
    </el-upload>
    <!-- 上传提示 -->
    <div v-if="showTip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c;">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c;">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
      v-model="dialogVisible"
      title="预览"
      width="800px"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto;"
      />
    </el-dialog>
  </div>
</template>

<script lang="ts" setup>
import { ref, getCurrentInstance, defineEmits, computed, watch } from 'vue'
import { ElMessage, ElLoading } from 'element-plus'
import { getToken, getTokenType } from '@/utils/auth'

const props = defineProps({
  modelValue: [String, Object, Array],
  // 图片数量限制
  limit: {
    type: Number,
    default: 5,
  },
  // 大小限制(MB)
  fileSize: {
    type: Number,
    default: 2,
  },
  // 文件类型, 例如['png', 'jpg', 'jpeg']
  fileType: {
    type: Array,
    default: () => ['png', 'jpg', 'jpeg'],
  },
  // 是否显示提示
  isShowTip: {
    type: Boolean,
    default: true,
  },
})
const emit = defineEmits(['update:modelValue'])
const number = ref(0)
const uploadList = ref([])
const dialogImageUrl = ref('')
const dialogVisible = ref(false)
const baseUrl = import.meta.env.VITE_BASE_API
const uploadImgUrl = ref(`${ baseUrl }/system/file/upload`) // 上传的图片服务器地址
const headers = ref({ Authorization: `Bearer ${ getToken() }` })
const fileList = ref([])
const showTip = computed(
  () => props.isShowTip && (props.fileType || props.fileSize),
)
watch(() => props.modelValue, val => {
  if (val) {
    // 首先将值转为数组
    const list = Array.isArray(val) ? val : props.modelValue.split(',')
    console.log(list, 'ss')
    // 然后将数组转为对象数组
    fileList.value = list.map(item => {
      item = { name: item, url: item }
      return item
    })
  } else {
    fileList.value = []
    return []
  }
}, { deep: true, immediate: true })

// 删除图片
function handleRemove(file, files) {
  emit('update:modelValue', listToString(fileList))
}
// 上传成功回调
function handleUploadSuccess(res) {
  uploadList.value.push({ name: '', url: res.data.url })
  console.log(fileList.value) 
  // debugger
  if (uploadList.value.length === number.value) {
    // fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value)
    uploadList.value = []
    number.value = 0
    emit('update:modelValue', listToString(fileList))
  }
}
// 上传前loading加载
function handleBeforeUpload(file) {
  let isImg = false
  if (props.fileType.length) {
    let fileExtension = ''
    if (file.name.lastIndexOf('.') > -1) {
      fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
    }
    isImg = props.fileType.some(type => {
      if (file.type.indexOf(type) > -1) return true
      if (fileExtension && fileExtension.indexOf(type) > -1) return true
      return false
    })
  } else {
    isImg = file.type.indexOf('image') > -1
  }
  if (!isImg) {
    ElMessage.error(
      `文件格式不正确, 请上传${ props.fileType.join('/') }图片格式文件!`,
    )
    return false
  }
  if (props.fileSize) {
    const isLt = file.size / 1024 / 1024 < props.fileSize
    if (!isLt) {
      ElMessage.error(`上传图片大小不能超过 ${ props.fileSize } MB!`)
      return false
    }
  }
  number.value++
}
// 文件个数超出
function handleExceed() {
  ElMessage.error(`上传文件数量不能超过 ${ props.limit } 个!`)
}

// 上传失败
function handleUploadError() {
  ElMessage.error('上传图片失败')
}
// 预览
function handlePictureCardPreview(file) {
  dialogImageUrl.value = file.url
  dialogVisible.value = true
}
// 对象转成指定字符串分隔
function listToString(list) {
  return list.map(el => el.response?.data.url)
}
// function listToString(list, separator) {
//   let strs = ''
//   separator = separator || ','
//   for (const i in list) {
//     if (undefined !== list[i].url && list[i].url.indexOf('blob:') !== 0) {
//       strs += list[i].url.replace(baseUrl, '') + separator
//     }
//   }
//   return strs != '' ? strs.substr(0, strs.length - 1) : ''
// }
</script>